Posted by zack on Tuesday, January 31, 2012 at 10:03pm.
Let x = adult tickets and y = student ones.
x = 9 - y
10x + 8y = 78
Substitute 9-y for x in second equation and solve for y. Insert that value into the first equation and solve for x. Check by inserting both values into the second equation.
6 Student tickets X $8.00 = $48.00
$78.00 minus the $48.00 = $30.00
$30.00 divided by $10.00 Adult Cost = 3 adult tickets.
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